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Feeling: Can't feel or hear the engine running from inside the car when stopped at the lights. Before oil change it made a few concerning noises that I thought were timing belt related and sounded like a sick tractor. Engine now revs more freely, idles silently and without any vibration. Fuel economy has improved 0.2l/hr when idling.

So I switched from the Penrite HPR-10 (10w-50 full synthetic) I was using to Penrite Racing10 (10w-40 full sythentic street/track oil) and I honestly noticed no difference...

Mind you the Racing10 was about $86 for a 5L bottle, yikes.

I keep reading all over the world that most people in the UK and Holden here in Aus run a semi-synthetic by choice.

Welp some Castrol Magnatec 10w-40 semi-snyth came on special for $18 a bottle which is amazingly cheap, it is normally around $46.00 (one of the most expensive semi's second only to what I get at Crazy Horse every other Saturday night).

Long story short my car was due for a service and it's now running $18 Castrol Magnatec 10w-40 semi-synthetic and is actually running quieter on idle than it was previously...

I will check in and let you guys know how it looks when I drop it out in 5000klms.